import sqlite3 
con = sqlite3.connect('mylistmanager.db') 
c = con.cursor() 
c.execute("alter table task add column startdate date")
con.commit() 
con.close() 
con = sqlite3.connect('mylistmanager.db') 
c = con.cursor() 
c.execute("alter table task add column duetime timestamp")
con.commit() 
con.close() 
con = sqlite3.connect('mylistmanager.db') 
c = con.cursor() 
c.execute("alter table task add column remind integer")
con.commit() 
con.close() 
